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How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar
...iew
if(filterPredicate)
{
filterPredicate = [NSCompoundPredicate andPredicateWithSubpredicates:[NSArray arrayWithObjects:filterPredicate, [NSCompoundPredicate orPredicateWithSubpredicates:predicateArray], nil]];
}
else
{
filterPredicate...
What is the real overhead of try/catch in C#?
...isn't a good way of controlling process flow, but where does this overhead come from and what is it's actual impact?
12 Ans...
What's the fastest way to merge/join data.frames in R?
...low we illustrate these points.
Its worthwhile to notice that the precise computation can make a huge difference on which package is fastest. For example, we do a merge and an aggregate below. We see that the results are nearly reversed for the two. In the first example from fastest to slowest w...
What is in your Mathematica tool bag? [closed]
...electEquivalents[hamlst,
#[[;; 3]] &,
#[[{4, 5}]] -> (Complex @@ #[[6 ;;]]) &,
{#1, SparseArray[#2]} &]
Honestly, this is my Swiss Army Knife, and it makes complex things very simple. Most of my other tools are somewhat domain specific, so I'll probably not pos...
How can I get a count of the total number of digits in a number?
...you could try:
Math.Ceiling(Math.Log10(n));
Correction following ysap's comment:
Math.Floor(Math.Log10(n) + 1);
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What is the simplest and most robust way to get the user's current location on Android?
...work.
One more approach is to use LocationClient http://developer.android.com/training/location/retrieve-current.html. But it requires Google Play Services apk to be installed on user device.
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Why is it bad practice to call System.gc()?
...c() , I was told it's bad practice to call System.gc() manually, but the comments were not entirely convincing. In addition, no one seemed to dare to upvote, nor downvote my answer.
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What is std::promise?
...fairly familiar with C++11's std::thread , std::async and std::future components (e.g. see this answer ), which are straight-forward.
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When to use LinkedList over ArrayList in Java?
...steps) for worst case, whereas in an ArrayList the desired position can be computed mathematically and accessed in O(1).
Another benefit of using a LinkedList arise when you add or remove from the head of the list, since those operations are O(1), while they are O(n) for ArrayList. Note that ArrayD...
O(nlogn) Algorithm - Find three evenly spaced ones within binary string
...figure that most of the class didn't solve it correctly, because I haven't come up with a solution in the past 24 hours.
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